House telephone-exchange



(No Model.) 2 Sheets-Sheet 1.

W. M. GOODRIDGE. HOUSE TELEPHONE EXCHANGE;

No. 417,018. Patented Dec. 10, 1889.

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W. M. GOODRIDGE. HOUSE TELEPHONE EXCHANGE I No. 417,018. Patented Dec. 10, 1889.

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' UNITED STATES PATENT OFFICE.

\VILLIAilI M. GOODRIDGE, OF HIGHLAND PARK, ASSIGNOR TO THE \VESTERN ELECTRIC COMPANY, OF CHICAGO, ILLINOIS.

HOUSE TELEPHONE-EXCHANGE.

SPECIFICATION forming part of Letters Patent No. 417,018, dated December 10, 1889.

' Application filed September 5, 1887. Serial No. 248,825. (No model.)

To all whmn it may concern: I may be connected with either of the stations 50 Beitknown thatI, IV ILLIAM M. GOODRIDGE, l 2 It will be seen that I have placed a a citizen of the United States, residing at loop spring-jack switch in this line a he- Ilighland Park, in the county of Lake and tween the outfit I) and the groulid-connection State of Illinois, have invented a certain new at the factory. The circuit may be traced and usefulImprovementinHouse Telephonefrom the spring of switch 0 to the contactlxchange Apparatus, (Case 6,) of which the point of said switch, and thence directly to following is a full, clear, concise, and exact ground. Vhe'n the city telephone-exchange description,reference heinghad to theaccomis thus connected directly through switch IO panying drawings, forming a part of this 0 to ground, the outfit may be used in the specification. ordinary manner without reference to the My invention relates to factory telephonefactory system, and, on the other hand, the exchange systems; and its object is to provide factory system may be used, as heretofore, facilities for connecting any station in the the same as if there were no means of con- I 5 factory with the station of the city exchange, neeting with the city wire-that is to say,

so thata single Wire extending from the faccommunication may be had between any two tory to the central exchange maybe extended of the stations 1, 2, and 3 without confusion to any one of the factory stations. and without reference to the telephone-line a.

My invention consists in switching appa- The loop-plug cl, when inserted in the spring- 20 ratus and circuits for looping into the genjack switch 0, lifts the spring of said switch 0 eral wire of the city telephone any one of the from itsground-contact,connectingsaid spring stations in the factory. with the tip of the plug and the frame or body As to the state of the art prior to myinvenof said switch with the sleeve of the plug. tion reference is made to Letters Patent No. The tip of said plug, it will be seen, is con- 2 5 356,427, granted Charles E. Scribner, .Ianuary nected through the ringing'key t0 the plug 6, 18,1887, Case 110. whichplug c is adapted to be inserted in any My invention is illustrated in the accomone of the metallic sockets l 2 3 of station 1.

panying drawings, in WhlCll- Ordinarily the socket 1 in station 1 will not Figure 1 is a diagram illustrative of the be used, since the outfit Z) and station 1 will 0 circuits of the factory system and the appa be so near together that it will not he necesratus for making connection with the city exsary to use the outfit of station 1 in talking change. Fig. 2 is a detailed sectional view of over the city line. hen, however, it is dethe loop-plug in the cord at the factory stasirable to use the outfit of station 1 for this tion near the city telephone. Fig. 3is an enpurpose, the plug 6 will be inserted in the 3 5 larged front view of a set of metallic sockets socket 1. Now, loop-plug (Z being in springand the springs connected therewith for closjack switch 0 and plug c inserted in socket ing the signahcircuit. Fig. 4 is a detailed 1 of station 1, the circuit of line a may he sectional view on line 00 a of Fig. traced to the spring of switch 0, thence to the Like parts are indicated by similar letters tip of loop-plug d, thence to plug 6 and 40 and figures of reference throughout the difsocket 1, thence to the switch f of station 1,

ferent figures. a and thence, when the telephone is on the I have shown three factory stations 1, 2, switch, by the lower contact of said switch f and 3. The telephone-line a comes from the to bell g, and thence by the common returncity exchange, and is connected in the usual wire It to the sleeve of loop-plug d, thence to 5 manner with the subscribers outfitb. This the frame of loop spring jack switch 0,

line after passing through the subscribers and thence by wire 1' to ground. Thus we 5 outfit is shown connected with the ground. have the bell g of station 1 included in the My invention relates more particularly to circuit of the telephonedine a. On removing the apparatus whereby this telephone-line a the telephone from switch f of station 1 the bell 9 will be disconnected and the telephone will be brought. into circuit. sired, the telephone outfit of station 1 may be connected with the city line a for communication. Ordinarily, however, the con nection will be desired between some station at a distance from the outfit bas, for example, station In such case the plug e will be inserted in the appropriate socket 3 of station 1. The loop-plug (1 being in the loop-switch c, as before described, the circuit formed by inserting plug 6 in socket 3 may be traced through the spring of switch 0 to tip of loopplng cl, and thence through the ringing-key it to said plug 6, and thence from socket 3 by wire 3 to switch 1 of station 3, and thence, when the telephone is 011 the switch 1, through bell m, and thence to the common returnwire it and back to the sleeve of loop-plug d and to ground, as before described. The attendant at the city-telephone outfit 1), after making this connection, will signal upon bell m at station 3 by closing the ringing-key 7.,

thus closing the circuit of battery 02- through said bell m. The circuit thus closed may be traced from the pole of the battery over wire 0 to the lower contact of key 7., and thence to plug 6, and thence from socket 3 over line 3 to switch 1, and thence through hell we to the common return-wire 71. at p, and thence to the pole of the battery. The signal will thus be sounded. at station 5, and the one who is called, on taking down his telephone from switch 1, will disconnect the bell m and bring his telephone into the circuit of line a. In like manner connection may be made between the telephone-line a and station 2 by inserting the plug 6 in socket 2. \Vhen the city line is connected with any one of the factory stations, the other two may com municate with one another in the ordinary manner, there being no interference 011 account of the connection with the city line.

I have shown at each of the stations 1, 2, and 3 three sockets. It will be understood that with three stations only two such sockets, with their corresponding keys, are required. Thus the key of the same number as the station, as shown in the drawings, may be considered simply as a dummy, ready, however, to be connected with circuits of a new station when a new station is added to the system.

Thus, it (1ee will consider the sockets and springs 1 2 3 of Fig. 3. as corresponding to the sockets and springs indicated by 1., 2, and 3 of station 2, Fig. 1. The central ring q is the terminal of one pole of the battery. The springs normally stand away from contact with this terminal q, as shown in Fig. 4. The sockets and springs of the other stations are of the same construction.

It is evident that my invention admits of various modifications as to details of construet-ioi'i which would readily suggest the1nselves to those skilled in the art, and I therefore do not limit myself to precise constructions shown.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. The combination, with the factory telephone-exchange system, of a subscribers outfit of the city exchange, the telephone-line of said subscribers outfit extending normally through the spring and insulated contact of a loop-switch to ground, a connection 1' between the frame of said switch and the ground, a loop-plug (1, adapted to .be inserted in said switch, and a plug e, in combination with the switches and circuits of several factory-stations, whereby any one of said stations may be connected with the city telephone-line.

2. The combination, with the telephone-line extending through the subscribers outfit to ground, of a loop-switch included in said ground-circuit, said loop-switch having its insulated contact and frame connected together, a loop-plug, and strands of a cord connected with the terminals thereof, one of said strands being provided with a terminal plug 6 and the other strand being connected with a line h, extending to several stations, each of said other stations being connected with circuits, as 2 3, extending to different sockets, with either of which sockets the terminal plug 6 is adapted to be connected, whereby either one of said stations maybe connected with the telephone-line, substantially as and for the purpose specified.

In witness whereof I hereunto subscribe my name this 13th day of July, A. D. 1887.

\VILLIAM M. GOODRIDGE.

\Vitnesses:

GEORGE P. BARTON, WM. M. GILLER. 

